“No one involved is willing to take responsibility for ­placing such a dangerous monster untagged and unmonitored in the ­community. This is a ­public safety issue. Mistakes were clearly made and our mum paid with her life.”

Lothian and Borders Police, who were the lead authority in the case, said: “We do not comment on specific cases.

“However, there is a protocol within MAPPA to conduct reviews of the processes ­utilised during the management of an offender to ensure procedures are being ­appropriately adhered to.”